An Estimation of Discounted Genetic Expressions of Dairy Traits in Iranian Holstein Herds
Ali
Sadeghi Sefidmazgi
دانشجوی دکتری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
Ardeshir
Nejati-Javaremi
دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
Mohammad
Moradi-Shahrbabak
استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
Seyed Reza
Miraei Ashtiani
استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
author
Peter
R AYMER
Abacus Bio Limited، نیوزیلند
author
text
article
2011
per
The objective of this study was to assess the Discounted Genetic Expressions (DGEs) for different categories of animal traits as regards Holstein cattle of Iran. Using discounted gene-flow principles, DGEs per calf born were estimated for self replacing females and also for their sires. In the situation for sires of self replacing females, relative GDEs per cow per year for annual cow traits, traits of the calf at birth and slaughter, traits of heifer and traits of cow at culling were estimated as 1, 0.96, 0.4, 0.44 and 0.43, respectively. The respective values for self replacing females were 1, 0.5, 0.21, 0.44 and 0.43, respectively. The effects of different factors on DGEs were quantified using sensitivity analysis. Results obtained in this study provide important information for properly weighting the traits in national selection indexes and as well in conducting cost- benefit analyses of breeding strategies.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
189
197
https://ijas.ut.ac.ir/article_23538_97beb01905406884a3652e9ccc1c1301.pdf
An Association between the C>T Single Nucleotide Polymorphism of Bovine OPN Gene and Milk Production and Composition in Iran Holstein Cattle
Majid
Pasandideh
دانش آموخته کارشناسی ارشد، دانشگاه شهید باهنر کرمان
author
Mohammadreza
Mohammad-abadi
عضو هیأت علمی، دانشگاه شهید باهنر کرمان
author
Alireza
Torang
بخش تحقیقات ژنومیکس، مدیریت منطقه شمال کشور (رشت)، پژوهشکده بیوتکنولوژی کشاورزی
author
Ali
Esmaeilizadeh kashkoueiyejh
عضو هیأت علمی، دانشگاه شهید باهنر کرمان
author
text
article
2011
per
Quantitative trait loci (QTL) affecting milk production traits on bovine chromosome 6 close to the OPN gene location have been identified through several whole genome scans. OPN is a phosphoprotein, synthesized in a variety of tissues and cells and secreted into body fluids. In this study, DNA was isolated from blood samples collected from 398 Holstein cows in Tehran and Esfahan provinces. DNA isolation was performed using salting out method. RFLP-PCR method was used for genotyping of SNP C>T at position 8514 in OPN gene. Frequencies of CC, CT and TT genotypes were estimated as 19, 57 and 24%, respectively. Hardy-Weinberg Equilibrium (HWE) was evaluated using ? square test. The genotypes in this locus deviated from HWE. In this study, significant associations were observed between c.8514C>T genotypes in OPN gene and FATP2X, PROPER305 traits. The SNP, showing signi?cant association with milk traits would provide an excellent opportunity for marker assisted selection programs in dairy cattle.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
199
205
https://ijas.ut.ac.ir/article_23539_f73a80ff3bd9389b0929ae9fa0266a57.pdf
The Effect of Degradability Rates of Different Starch Sources on Performance and Blood Metabolites of Holstein Dairy Cows in their Early Lactation
Hamid
Amanlou
دانشیار، دانشگاه زنجان
author
Behzad
Alizadeh
دانش آموخته کارشناسی ارشد، دانشگاه زنجان
author
Mohammad-Hossein
Shahir
استادیار، دانشگاه زنجان
author
Tahereh
Amirabadi Farahani
دانشجوی کارشناسی ارشد، دانشگاه زنجان
author
text
article
2011
per
In order to examine the effect of degradability rates of different starch sources on performance of Holstein dairy cows in their early lactation, twenty multiparous lactating Holstein cows (586±33.7 BW; 48.15±9.32 DIM) were made use of in a randomized complete block design of four treatments during the 65 days of the experimental period. Cows were fed the following diets: 1) 100% barley, 2) 67% barley and corn 33%, 3) 33% barley and 67% corn and finally 4) corn by 100%. Cows were offered feed individually and three times daily. Dry Matter Intake (DMI), milk yield and composition, feed efficiency, blood metabolites, ruminal and fecal pH, body weights and body condition scores were assessed. Dry matter intakes (P=0.01), and milk yields (P=0.03) were highest for cows fed diet containing 33% barley and 67% corn. Milk fat percentage (P=0.001), milk non fat solid percentage (P=0.17) and milk lactose content, percentagewise (P=0.2) were lowest for cows fed diet containing 100% barley. Ruminal pH (P=0.09) was lowest in cows fed diet containing 100% barley while highest for cows fed diet containing 100% corn. No significant differences were found in blood BHBA, NEFA, BUN and in total protein. Blood glucose (P=0.018) and albumin were recorded as lowest in cows fed diet containing 100% barley. These results most probably reflect a more optimal synchronization of dietary protein and energy for dairy cows when fed diets containing 33% barley and 67% corn in their early lactating diets rather than alfalfa hey formerly fed as the sole forage source.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
207
219
https://ijas.ut.ac.ir/article_23540_d81b21ccce45de8452a13a10f5089404.pdf
Effect of Supplementation of Different Level Protein Diets with Rumen Protected Methionine and Lysine on Performance and Ruminal Parameters of Holstein Dairy Cows in Early Lactation
Hossein
Abdi Benmar
دانشجوی کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Kamran
Rezayazdi
دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Mehdi
Dehghan banadaki
دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
text
article
2011
per
The objective of this study was to evaluate the effects of supplementation of different level protein diets with rumen protected methionine and lysine on performance and ruminal parameters in Holstein dairy cows when in their early lactation. Twenty one dairy cows in their early lactations were assigned to three treatments in a randomized block design experiment of a 35-d duration period. Diets were: 1) High protein diet containing 17.5% crude protein (CP), 2) Moderate protein diet bearing 16% CP along with 12 gr/d of rumen protected methionine, 3) Low protein diet with 14.5% CP plus 14 gr/d of rumen protected methionine and also 5 gr/d of rumen protected lysine. Dry matter intake, milk production, 3.5% fat corrected milk (3.5% FCM), percent content of milk fat, molar concentration of rumen volatile fatty acids and ruminal fluid pH were not significantly affected by diets. However, experimental treatments significantly affected percent of milk protein, milk urea nitrogen and ruminal ammonia concentration (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
221
230
https://ijas.ut.ac.ir/article_23541_20cf4f392ea5434ebb91546d7246a32f.pdf
The in vitro Organic Matter Digestibility of Pistachio Hull using Rumen Fluid in Taleshi Sheep
Reza
Lotfi noghabi
دانش آموخته کارشناسی ارشد، دانشکده کشاورزی دانشگاه تربیت مدرس، تهران
author
Yousef
Rouzbehan
دانشیار، دانشکده کشاورزی دانشگاه تربیت مدرس، تهران
author
text
article
2011
per
This study was conducted to assess the in vitro organic matter digestibility (OMD) of pistachio hull using rumen fluid of Taleshi sheep. Animals were fed diets composed of 34% pistachio hull, 29% grape pomace, 32% alfalfa, and 5% grain barley. The chemical composition and phenolics' levels of pistachio hull, either Industrially Dried Pistachio Hull (IDPH) or sun Dried Pistachio Hull (SDPH) were determined. In vitro gas production for 24 h either with or without Polyethylene Glycol (PEG) addition was made use of estimate the OMD for IDPH or SDPH for either of the days 0, 3 or 30. For IDPH, the OMD on days 0, 3 or 30 (with no PEG) were respectively estimated as 54, 65.6 and 63.4, while with PEG application they were 65.2, 71.3 and 70.1 respectively (P<0.05). Also, the OMD for SDPH on days 0, 3 or 30 (with no PEG) were estimated as 52.6, 62.9 and 60.3 respectively and, which with an addition of PEG reached 62.1, 68.6 and 67.3 respectively (P<0.05). The results finally revealed that the microbial activity in the ruminal ecosystem of Taleshi sheep have the capability to degrade the hydrolysable tannin in pistachio hull to be later used as a source of energy.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
231
237
https://ijas.ut.ac.ir/article_23542_44d1d5666dcca8f242a706a8b5da4ae1.pdf
A Determination of the Optimal Slaughter Weight, Based on Carcass Characteristics for Ghezel and Mehraban Male Lambs
Jamshid
Izadifard
مربی، دانشکده کشاورزی دانشگاه شیراز
author
Hadi
Atashi
استادیار، دانشکده کشاورزی دانشگاه شیراز
author
text
article
2011
per
One hundred and seventy four Ghezel and 130 Mehraban weaned male lambs were utilized to study the effect of on post weaning growth on slaughter weight and carcass traits. The lambs in each breed were randomly assigned to predetermined slaughter weight groups of 30, 40 or 50 Kg and were so far fattened as to reach their assigned slaughter weights. The average post weaning daily gain was estimated to be 185.82 (±54.88) grams, increasing significantly (p
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
239
245
https://ijas.ut.ac.ir/article_23543_4d514d51ddab7b77210cbdf2a9e512ca.pdf
Effects of Feeding Different Levels of Alfalfa Hay and Corn Silage on Milk Production and Blood Metabolites in Holstein Cows
Amir
Akbari Afjani
دانشجوی کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Abolfazl
Zali
استادیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Mehdi
Ganjkhanlou
استادیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Mehdi
Dehghan Banadaki
استادیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
text
article
2011
per
The effect of different levels of alfalfa hay and corn silage, in early lactation diet, on milk production and on milk components in Holstein cows was investigated. Fifteen Holstein cows (37 ±10 DIM) were taken in a completely randomized design experiment, lasting for 9 weeks. Three levels of hay and corn silage namely: 1) 10% alfalfa -30% silage corn (Diet 1), 2) 20% alfalfa -20% silage corn (Diet 2) and 3) 30% alfalfa -10% silage corn (Diet 3) former the treatments. The ratio of forage to concentrate was taken as the same (40: 60) in all the treatments. Cows were fed in Total Mixed Rations (TMR) and twice daily. They were milked 3 times a day at 02:00, 10:00, and 18:00 h. Milk production was recorded at each milking, but milk composition was weekly determined. Dry matter intake for each cow was daily assessed. Dry matter intake was higher (P0.05). Blood parameters were not seriously affected by dietary treatments (P>0.05), although glucose content for Diet 1 was higher than that for Diet 2.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
247
253
https://ijas.ut.ac.ir/article_23544_af0d7a67632eb538da7eb4326e2ee9c5.pdf
Estimating Chemical Composition, Degradation Parameters and Gas Production of Persian Clover Nutrients at Different Plant's Growth Stages
Seyed Mohammad Mehdi
Tabatabaei
عضو هیأت علمی، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
Behrouz
Najaf-nejad
دانشجوی دکتری، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
Pouya
Zamani
عضو هیأت علمی، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
Akbar
Taghizadeh
عضو هیئت علمی گروه علوم دامی دانشگاه تبریز
author
Ahmad
Ahmadi
عضو هیأت علمی، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
Hassan
Aliarabi
عضو هیأت علمی، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
text
article
2011
per
This study was conducted to determine the chemical composition, degradability characteristics gas production as well as the phenomenon of the Persian clover (Trifolium resopinatum) when at some growth stages of the were early budding to full flowering, namely: early budding (I), full budding (II), early flowering (III) as well as full flowering stage (IV). Four fistulated Mehraban male sheep were taken as experimental specimens to estimate the degradability parameters. The results obtained from the chemical composition indicated that as the plant growth stage advanced, percentages of organic matter and NDF increased but the levels of CP, NFC and EE decreased significantly (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
255
264
https://ijas.ut.ac.ir/article_23545_10bd8fb2e3759a2a0e0a0ab2f631ea58.pdf
Effect of Considering Nutrient Equivalency of a Commercial Multi Enzyme (Natuzyme-P) in Feed Formulation on Broiler Chicks’ Performance
Mojtaba
Zaghari
دانشیار، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Saeid
Khalaji
دانشجوی دکتری، پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
text
article
2011
per
This experiment was conducted to evaluate the effect of the addition of a multi enzyme (Natuzyme-P) to corn-soybean based diets and to determine the enzyme's nutrient equivalency on broiler chicks’ performance. Ninety six day-old male broiler chicks were randomly assigned to a number of 24 battery cages in a completely randomized design. The chicks were grown up to 6 wk of age. Six diets (control, negative control, positive control along with three other diets made on the basis of 50, 100 and 120% nutrient equivalency of the enzyme) were formulated and fed to four pens, each pen housing 4 chicks up to 42 days of age. The control diet was formulated with no enzyme supplementation, the positive control diet contained sufficient nutrients for normal broiler growth along with the addition of enzyme as feed additive with an exclusion of the nutrient equivalency of the enzyme and while the negative control diet formulated with no enzyme supplement, but corrected to a nutrient equivalency level for the enzyme. Diets 50, 100 and 120% were prepared together with enzyme supplement and a correction of the diets to 50, 100 and 120% of nutrient equivalency of the enzyme. Body weight gain, feed intake and feed conversion ratio were assessed at 21, 35 and 42 d of age. Results indicated significant differences among the treatments in body weight gain (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
265
273
https://ijas.ut.ac.ir/article_23546_13d9f51e1a69114d1e9b39c75af63495.pdf
Effect of Various Levels of Barley and Multi Enzyme on Metabolizable Energy, Dry Matter and Protein Digestibility of Diets and Performance of Broiler Chicks
Ali-asghar
Saki
دانشیار، دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
Sara
Mirzaei Goudarzi
دانشجوی دکتری پردیس کشاورزی و منابع طبیعی دانشگاه تهران
author
Shahab
Ghazi
استادیار دانشکده کشاورزی دانشگاه رازی کرمانشاه
author
Mohammad Mehdi
Moeini
استادیار دانشکده کشاورزی دانشگاه رازی کرمانشاه
author
Fatemeh
Sahebi Ala
دانشجوی کارشناسی ارشد دانشکده کشاورزی دانشگاه بوعلی سینا، همدان
author
text
article
2011
per
This experiment was carried out for a determination of metabolizable energy and the effect of the Grind multienzyme on in-vitro dry matter and protein digestibility in diets, and as well on performance of broiler chicks. A number of 800 day old unsexed Arbor Acres broilers were placed in 8 treatments and 4 replicates (25 chicks each). A completely Randomized Design (CRD) of a factorial arrangement (4×2), along with 4 levels of barley (0, 10, 20 and 30%) and 2 levels of enzyme, (0 and 500 g/ton) were modulated for a duration of 42 days. Apparent Metabolizable Energy (AME), the same factor (AME) corrected by nitrogen (AMEn), True Metabolizable Energy (TME), and true metabolizable energy corrected by nitrogen (TMEn) as well as digestibility of barley protein (based on dry matter) were recorded as 2886.6, 3015.8, 3624.2, 3205.5 kcal/kg and 57.95% respectively. Feed intake rate, in control treatment (2776.66g), was significantly (p
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
42
v.
3
no.
2011
275
283
https://ijas.ut.ac.ir/article_23547_c1f16789b8cb308571d616377607ae49.pdf